DC_Buildings.R

# Oleksiy Anokhin
# October 26, 2018

# Exploring buildings data

# Install packages
library(tidyverse)

## -- Attaching packages ------------------------------------------------- tidyverse 1.2.1 --

## v ggplot2 3.1.0     v purrr   0.2.5
## v tibble  2.0.0     v dplyr   0.7.8
## v tidyr   0.8.2     v stringr 1.3.1
## v readr   1.3.1     v forcats 0.3.0

## Warning: package 'readr' was built under R version 3.5.2

## -- Conflicts ---------------------------------------------------- tidyverse_conflicts() --
## x dplyr::filter() masks stats::filter()
## x dplyr::lag()    masks stats::lag()

library(leaflet)
library(geojsonio)

## 
## Attaching package: 'geojsonio'

## The following object is masked from 'package:base':
## 
##     pretty

library(rgdal)

## Loading required package: sp

## rgdal: version: 1.3-6, (SVN revision 773)
##  Geospatial Data Abstraction Library extensions to R successfully loaded
##  Loaded GDAL runtime: GDAL 2.2.3, released 2017/11/20
##  Path to GDAL shared files: C:/Users/wb516241/Documents/R/win-library/3.5/sf/gdal
##  GDAL binary built with GEOS: TRUE 
##  Loaded PROJ.4 runtime: Rel. 4.9.3, 15 August 2016, [PJ_VERSION: 493]
##  Path to PROJ.4 shared files: C:/Users/wb516241/Documents/R/win-library/3.5/sf/proj
##  Linking to sp version: 1.3-1

library(sf)

## Warning: package 'sf' was built under R version 3.5.2

## Linking to GEOS 3.6.1, GDAL 2.2.3, PROJ 4.9.3

# Set wd

# Read the file
dc_buildings <- st_read("DistrictofColumbia.geojson", quiet = TRUE)

dc_buildings <- st_simplify(dc_buildings)

## Warning in st_simplify.sfc(st_geometry(x), preserveTopology, dTolerance):
## st_simplify does not correctly simplify longitude/latitude data, dTolerance
## needs to be in decimal degrees

# Build a map
dc_map <- leaflet() %>%
  addProviderTiles(providers$CartoDB.Positron) %>%
  addPolygons(data = dc_buildings, color = "black", opacity = 1)
dc_map